![]() ![]() Some mercury salts (such as HgCl 2) are sufficiently volatile to exist as an atmospheric gas. Most inorganic mercury compounds are white powders or crystals, except for mercuric sulphide, which is red and turns black after exposure to light. These mercury compounds are also called mercury salts. Inorganic mercuric compounds include mercuric sulphide (HgS), mercuric oxide (HgO) and mercuric chloride (HgCl 2). This vaporises the mercury in the ore, and the vapours are then captured and cooled to form the liquid metal mercury. The metallic form is refined from mercuric sulphide ore by heating the ore to temperatures above 540º C. Through history, deposits of cinnabar have been the source ores for commercial mining of metallic mercury. Mercury is mined as mercuric sulphide ( cinnabar ore). Some people who have breathed mercury vapours report a metallic taste in their mouths. The higher the temperature, the more vapours will be released from liquid metallic mercury. Mercury vapours are colourless and odourless. If not enclosed, at room temperature some of the metallic mercury will evaporate and form mercury vapours. ![]() Many inorganic and organic compounds of mercury can be formed from Hg(II).Įlemental mercury is a shiny, silver-white metal that is a liquid at room temperature and is traditionally used in thermometers and some electrical switches. Mercury can be bound to other compounds as monovalent or divalent mercury (also expressed as Hg(I) and Hg(II) or Hg 2+, respectively). Mercury is rarely found in nature as the pure, liquid metal, but rather within compounds and inorganic salts. In pure form, it is known alternatively as "elemental" or "metallic" mercury (also expressed as Hg(0) or Hg 0). Like lead or cadmium, mercury is a constituent element of the earth, a heavy metal. Mercury occurs naturally in the environment and exists in a large number of forms. ![]()
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